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These are Top 20 Hacking Tools, the list is exhaustive, this are a few to name.

Nessus

The “Nessus” Project aims to provide to the internet community a free, powerful, up-to-date and easy to use remote security scanner for Linux, BSD, Solaris, and other flavors of Unix.

Ethereal

Ethereal is a free network protocol analyzer for Unix and Windows. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session.

>Ettercap is a multipurpose sniffer/interceptor/logger for switched LAN. It supports active and passive dissection of many protocols (even ciphered ones)and includes many feature for network and host analysis.

Nikto

Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 2500 potentially dangerous files/CGIs, versions on over 375 servers, and version specific problems on over 230 servers.

John the Ripper

John the Ripper is a fast password cracker, currently available for many flavors of Unix.

OpenSSH

OpenSSH is a FREE version of the SSH protocol suite of network connectivity tools, which encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other network-level attacks.

TripWire

Tripwire is a tool that can be used for data and program integrity assurance.

Kismet

Kismet is an 802.11 wireless network sniffer – this is different from a normal network sniffer (such as Ethereal or tcpdump) because it separates and identifies different wireless networks in the area.

NetFilter

NetFilter and iptables are the framework inside the Linux 2.4.x kernel which enables packet filtering, network address translation (NAT) and other packetmangling.

IP Filter

IP Filter is a software package that can be used to provide network address translation (NAT) or firewall services.

pf

OpenBSD Packet Filter

fport

fport identifys all open TCP/IP and UDP ports and maps them to the owning application.

SAINT

SAINT network vulnerability assessment scanner detects vulnerabilities in your network’s security before they can be exploited.

OpenPGP

OpenPGP is a non-proprietary protocol for encrypting email using public key cryptography. It is based on PGP as originally developed by Phil Zimmermann.